[Bug 2022102] Re: subiquity fails to see autoinstall data conveyed by cloud-init 23.2

[Dan Bungert]

Two different version of the fix are in place:

1) Mantic+ - read combined-cloud-config.json, but this requires that cloud-init 23.3 or later is present in the HOST os
2) Jammy - use the legacy method of reading autoinstall data.  Requires that compatible versions of cloud-init are int the snap and in the host OS.

** Changed in: cloud-init (Ubuntu Jammy)
       Status: New => Invalid

** Changed in: subiquity (Ubuntu Jammy)
       Status: New => Fix Committed

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Title:
  subiquity fails to see autoinstall data conveyed by cloud-init 23.2

Status in subiquity:
  Fix Committed
Status in cloud-init package in Ubuntu:
  Invalid
Status in subiquity package in Ubuntu:
  Fix Committed
Status in cloud-init source package in Jammy:
  Invalid
Status in subiquity source package in Jammy:
  Fix Committed
Status in cloud-init source package in Mantic:
  Invalid
Status in subiquity source package in Mantic:
  Fix Committed

Bug description:
  When attempting to send autoinstall data by way of cloud-config on
  cloud-init v23.2, subiquity fails to retrieve this data from cloud-
  init.

  In this case, the following can be seen in subiquity-server-debug.log:

  Traceback (most recent call last):
    File "/snap/subiquity/4709/usr/lib/python3/dist-packages/cloudinit/sources/__init__.py", line 1133, in pkl_load
      return pickle.loads(pickle_contents)
  AttributeError: Can't get attribute 'IscDhclient' on <module 'cloudinit.net.dhcp' from '/snap/subiquity/4709/usr/lib/python3/dist-packages/cloudinit/net/dhcp.py'>

  The pickle file has been written by the host system cloud-init v23.2,
  whereas the older cloud-init in the snap is failing to read the data.

  At the moment mantic ISOs are affected, future ISO builds such as
  jammy would also be affected when leading up to 22.04.3.

  A proposed workaround for subiquity is to run a python script outside
  the snap context to retrieve the data.

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